Impression-cup.



L. ROBERTSON. IMPRESSION 0UP. APPLICATION FILED 00T.15, 1910. RENEWED00131, 1913.

Patented June 2, 191% W'inasees J array UNITED STATES PATENT OFFICE.

LUGIUS ROBERTSON, OF MADISONVILLE, OHIO.

IMPRESSION-CUP.

Application filed October 15, 1910, Serial No. 587,310. Ecnewcd October31, 1913.

To all 107mm it may concern:

Be it known that I, Looms ROBERTSON, a citizen of the United States,residing at liladisonville, in the county of Hamilton and State of Ohio,have invented new and useful Improvements in. Impression-Cups, of whichthe following is a specification.

My invention belongs to that class of impression cups used in dentistryto obtain a correct and perfect contour of that part of the mouth towhich plates carrying artificial teeth are to be fitted; the inventionrelating particularly to that part of the art or process by which theimpression is formed from which the plaster Paris cast is made, whilethe impression cup is in the month.

One of the salient and essential features of my invention consists inproviding the impression cup with a hollow handle which acts as a troughor funnel for carrying the liquid plaster Paris into the cup when in themouth of the patient.

Another important feature consists in providing a lip guard inconnection with the hollow handle, to assist in forming the funnel forcarrying the plaster Paris into the cup and for holding the lip andmustache in a position to protect the same and at the same time presenta better opportunity for efficient service.

Another feature consists in making the lip guard. removable andadjustable.

Another feature consists in placing finger holds in the upper cup.

Still another feature consists in making the lip guard adjustable on thehandle of the cup.

In the accompanying drawing forming part of this specification Figure 1is a perspective view of the impression cup for the upper part of themouth, the lip guard being in place thereon; Fig. 2 is a simllar viewwith the lip guard removed; Fig. 3 is a perspective view of the lipguard used with the upper impression cup; Fig. 4 is a perspective viewof the lip guard used with the lower impression cup, and Fig. 5 is adetached view showing how the lip guard can be made adjustable.

In Figs. 1, 2, and 3, I illustrate the impression cup for taking theimpressions of the roof or upper part of the mouth includ ing the uppergums or ridge. I do not illustrate or describe a cup for the lower jawas it will be readily understood that my invention can be adapted forthat part of the Specification of Letters Patent.

Patented June 2, 1914.

Serial No. 798,584.

month by forming the lower impression cup after the style of the uppercup; only adapting it for the lower part of the mouth.

The upper cup is formed as shown in Figs. 1, 2 and 3 having a troughlike depression 1, formed between walls 2, 2, and connected by an arch3, the trough walls and arch are widest at the forward end of the cupand narrowing as they approach the handle 4-, the trough, walls and archconforming in contour to the upper part of the mouth from which theimpression is to be taken. In the outer face of the cup I place fingerholds 5, in the trough 1. The finger holds are present so that thefinger points will pass up into them so as to hold the cupfirmly inposition and to prevent slipping of the fingers. The handle 4 connectedto the rear of the cup is hollow having the depression 6 in its face. oneach side of the handle I form ears 7 having slots 8 which may pass ontirely through the ears or only appear as re cesscs. The depression 6 inthehandle leads to and meets the trough 1 at its rear part 9, beingslightly higher than the trough. The upper gum ridge passes into thetrough 1 when the cup is used and the arch 3 fits the mouth roof.

The lip guard is formed like a saddle or hood and is composed of arch 10with a reinforced edge 12, depending lugs 13, and diverging wings orextensions 14, the wings at their lower edges having recesses 15 whichfit ontothe edge of walls 2, at the rear of the cup. The lugs 13 fitinto the recesses 8 in cars 7 and together with the recesses 15 on wings14- hold the lip guard in place. When the lip guard is in position itwill readily be seen that a funnel is formed. When I make the lip guardadjustable I form holes 30 in the ears 7 and place pins as 31 in placeof depending lugs 13, so as to guard used for upper cup except that itswings 15, 15, are slightly differently formed,

(see Fig. 4), and one is shown as having pins instead of a dependinglug.

The impression cups just described are of the usual formation except thehollow handle, finger holds and the lip guard and their peculiarconstruction and formation in connection with the cups.

I will now describe another feature of my invention.

Along the edge w 50-- (see F ig. 1), I: place soft bees waX, which ispressed into proper formation when the impression cups are put into themouth; the bees wax thus pressed is chilled and trimmed, if necessary,ithus forming a dam or retaining wall to hold the liquid plaster Parisand keep it; from running into the patients throat.

hen the impression cups are in the mouth the dam holds the plaster Parisin proper position and allows it to flow freely, steadily and uniformlyto fill up every crevice, interstice and depression, so as toform aperfect cast; the result thus being the same in a hard, strong mouth ora' spongy, soft and malformed mouth, incident to neglect of the teethand gums. The; impressions formed by this cup are perfect: and conformtechnically to the contour of the upper and lower parts of the moutlriThe plaster Paris as poured into the funnel; shaped mouth formed by thehandle andj lip guard will find its way into the impression cupuninterruptedly without assistance or inconvenience. I may dispense withthe lip guard if I so desire. I may use the cups without the dam, if Ifind it desirable.

While I have explained one specific form of cups I do not wish to limitmyself to such specific construction, but I may change, alter and modifythe same and still remain within the scope of my invention.

Vhat I claim as new and of my invention and desire to secure by LettersPatent is:

1. In an impression cup of the character described, a cup part, said cuppart provided with a trough like handle open at the top.

2. The combination in a dental impression cup of a hollow handle with aremovable lip guard, as set forth.

3. The combination in a dental impression cup having finger holds in itsface, of a hollow handle.

4. In an impression cup of the character described, a cup part, fingerholds depressed in the face of said cup part, as set forth.

5. The combination in a dental impression cup of a handle provided witha lip guard, as set forth.

6. In a dental impression cup, the combination of a hollow handle andlip guard, said handle provided with slotted ears and the lip guardprovided with depending lugs, the depending lugs fitting said ears toattach the lip guard to the handle, as set forth.

7. In a dental impression cup, the combination of a hollow handle andlip guard, said lip guard provided with grooved wings which engage therear part of the cup, as set forth.

8. The combination in a dental impression cup, of a hollow handle, and atemporary dam in said cup, said dam made of a moldable substance forretaining the material poured into said cup, as set forth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

LUCIUS ROBERTSON.

Witnesses:

H. E. CARsTn-Us, WM. Harmon.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner 0! Iatents, Washington, D. 0.

